Php 检查是否已登录_Php - Fatal编程技术网

Php 检查是否已登录

php

Php 检查是否已登录,php,Php,大家好, 我试图弄明白为什么我的脚本一直重定向到我的登录页面。到目前为止我还没有找到它。有人能解释一下我犯了哪些错误吗？这是我的密码 functions.php function redirect_to($location = NULL) { if ($location != NULL) { header("Location: {$location}"); exit; } } function include_layout_template($

大家好,

我试图弄明白为什么我的脚本一直重定向到我的登录页面。到目前为止我还没有找到它。有人能解释一下我犯了哪些错误吗？这是我的密码

functions.php

function redirect_to($location = NULL) {
    if ($location != NULL) {
        header("Location: {$location}");
        exit;
    }
}

function include_layout_template($template="") {
    include(SITE_ROOT.DS.'public'.DS.'layouts'.DS.$template);
}

<?php

require_once('../../includes/initialize.php'); ?>
<?php if (!$session->is_logged_in()) { redirect_to("login.php"); } ?>

<?php  include_layout_template("admin_header.php"); ?>
<a href="logout.php">Logout</a>


<?php  include_layout_template("admin_footer.php"); ?>

<?php


class Session {

    public $logged_in = false;
    public $user_id;
    public $message;

    function __construct() {
        session_start();
        $this->check_message();
        $this->check_login();
        if($this->logged_in) {
            // actions to take right away if user is logged in
        } else {
            // actions to take right away if user is not logged in
        }
    }

    public function login_user($user) {
        if($user) {
            $this->user_id = $_SESSION['user_id'] = $user->id;
            $this->logged_in = true;
        }
    }

    public function is_logged_in() {
        return $this->logged_in;
    }

    public function logout() {
        unset($_SESSION['user_id']);
        unset($this->user_id);
        $this->logged_in = false;
    }

    private function check_login() {
        if(isset($_SESSION['user_id'])) {
            $this->user_id = $_SESSION['user_id'];
            $this->logged_in = true;
        } else {
            unset($this->user_id);
            $this->logged_in = false;
        }
    }
    private function check_message() {
        // Is there a message stored in the session?
        if(isset($_SESSION['message'])) {
            // Add it as an attribute and erase the stored version
            $this->message = $_SESSION['message'];
            unset($_SESSION['message']);
        } else {
            $this->message = "";
        }
    }
}

$session = new Session();
//$message = $session->message();

<?php

require_once('../../includes/initialize.php');

class Users extends DatabaseQuery
{

    protected $tablename = 'users';
    protected $db_fields = array('id', 'first_name', 'last_name', 'password', 'username');
    public $id;
    public $first_name;
    public $last_name;
    public $password;
    public $username;

    public static function create_user($first_name, $last_name, $password, $username)
    {
        global $database;
        $sql = "INSERT INTO users (";
        $sql .= "first_name, last_name, password, username) ";
        $sql .= "VALUES (";
        $sql .= "'{$first_name}', '{$last_name}', '{$password}', '{$username}')";
        $result = $database->query($sql);
        return $result;

    }

    public static function find_username($username) {
        global $database;
        $sql = "SELECT * FROM users ";
        $sql .= "WHERE username= '{$username}' ";
        $sql .= "LIMIT 1";
        $result = $database->query($sql);
        $admin = mysqli_fetch_assoc($result);
        return $admin;
    }


    public static function find_password($username, $password) {
        global $database;
        $sql = "SELECT * FROM users ";
        $sql .= "WHERE username= '{$username}' ";
        $sql .= "And password=".crypt($password) ;
        $sql .= " LIMIT 1";
        $result = $database->query($sql);
        $admin = mysqli_fetch_assoc($result);
        return $admin;
    }

    public static function password_check($password, $existing_hash) {

        $hash = crypt($password, $existing_hash);
        if ($hash === $existing_hash) {
            return true;
        } else {
            return false;
        }
    }

    public static function login($username, $password) {
        $admin = self::find_username($username);
        if ($admin) {
            // found username, check password.
            if (self::password_check($password, $admin['password'])) {
                //password matches
                return $admin;
            } else {
                //password does not match
                return false;
            }
        } else {
            // admin not found
            return false;
        }
    }

}

$user = new Users();

<?php


/**
 * FIRSTNAME        LASTNAME        PASSWORD        USERNAME
 * Coos             Wolff           secret          Admin
 * Kevin            Doofus          password        Kevin
 */

include_once("../../includes/initialize.php");

if (isset($_POST['submit'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $first_name = $_POST['first_name'];
    $last_name = $_POST['last_name'];

    $login = Users::login($username, $password);

    if($login) {
        $session->logged_in = true;
        redirect_to('index.php');
    } else {
        redirect_to('login.php');
    }

} ?>

<form id='login' action='create_user.php' method='post' accept-charset='UTF-8'>
    <fieldset >
        <legend>Create User</legend>
        <input type='hidden' name='submitted' id='submitted' value='1'/>

        <label for='username' >UserName:</label>
        <input type='text' name='username' id='username'  maxlength="50" />

        <label for='password' >Password:</label>
        <input type='password' name='password' id='password' maxlength="50" />

        <label for='firstName' >FirstName:</label>
        <input type='text' name='first_name' id='first_name'  maxlength="50"  />

        <label for='lastName' >LastName:</label>
        <input type='text' name='last_name' id='last_name'  maxlength="50" />

        <input type='submit' name='submit' value='Submit' />
    </fieldset>
</form>

<hr /><br /><hr />

<form id='login' action='login.php' method='post' accept-charset='UTF-8'>
    <fieldset >
        <legend>Login</legend>
        <input type='hidden' name='submitted' id='submitted' value='1'/>

        <label for='username' >UserName:</label>
        <input type='text' name='username' id='username'  maxlength="50" VALUE="Kevin"/>

        <label for='password' >Password:</label>
        <input type='password' name='password' id='password' maxlength="50" />

        <label for='firstName' >FirstName:</label>
        <input type='text' name='first_name' id='first_name'  maxlength="50" value="Kevin" />

        <label for='lastName' >LastName:</label>
        <input type='text' name='last_name' id='last_name'  maxlength="50" value="Doofus"/>


        <input type='submit' name='submit' value='Submit' />
    </fieldset>
</form>

index.php

function redirect_to($location = NULL) {
    if ($location != NULL) {
        header("Location: {$location}");
        exit;
    }
}

function include_layout_template($template="") {
    include(SITE_ROOT.DS.'public'.DS.'layouts'.DS.$template);
}

<?php

require_once('../../includes/initialize.php'); ?>
<?php if (!$session->is_logged_in()) { redirect_to("login.php"); } ?>

<?php  include_layout_template("admin_header.php"); ?>
<a href="logout.php">Logout</a>


<?php  include_layout_template("admin_footer.php"); ?>

<?php


class Session {

    public $logged_in = false;
    public $user_id;
    public $message;

    function __construct() {
        session_start();
        $this->check_message();
        $this->check_login();
        if($this->logged_in) {
            // actions to take right away if user is logged in
        } else {
            // actions to take right away if user is not logged in
        }
    }

    public function login_user($user) {
        if($user) {
            $this->user_id = $_SESSION['user_id'] = $user->id;
            $this->logged_in = true;
        }
    }

    public function is_logged_in() {
        return $this->logged_in;
    }

    public function logout() {
        unset($_SESSION['user_id']);
        unset($this->user_id);
        $this->logged_in = false;
    }

    private function check_login() {
        if(isset($_SESSION['user_id'])) {
            $this->user_id = $_SESSION['user_id'];
            $this->logged_in = true;
        } else {
            unset($this->user_id);
            $this->logged_in = false;
        }
    }
    private function check_message() {
        // Is there a message stored in the session?
        if(isset($_SESSION['message'])) {
            // Add it as an attribute and erase the stored version
            $this->message = $_SESSION['message'];
            unset($_SESSION['message']);
        } else {
            $this->message = "";
        }
    }
}

$session = new Session();
//$message = $session->message();

<?php

require_once('../../includes/initialize.php');

class Users extends DatabaseQuery
{

    protected $tablename = 'users';
    protected $db_fields = array('id', 'first_name', 'last_name', 'password', 'username');
    public $id;
    public $first_name;
    public $last_name;
    public $password;
    public $username;

    public static function create_user($first_name, $last_name, $password, $username)
    {
        global $database;
        $sql = "INSERT INTO users (";
        $sql .= "first_name, last_name, password, username) ";
        $sql .= "VALUES (";
        $sql .= "'{$first_name}', '{$last_name}', '{$password}', '{$username}')";
        $result = $database->query($sql);
        return $result;

    }

    public static function find_username($username) {
        global $database;
        $sql = "SELECT * FROM users ";
        $sql .= "WHERE username= '{$username}' ";
        $sql .= "LIMIT 1";
        $result = $database->query($sql);
        $admin = mysqli_fetch_assoc($result);
        return $admin;
    }


    public static function find_password($username, $password) {
        global $database;
        $sql = "SELECT * FROM users ";
        $sql .= "WHERE username= '{$username}' ";
        $sql .= "And password=".crypt($password) ;
        $sql .= " LIMIT 1";
        $result = $database->query($sql);
        $admin = mysqli_fetch_assoc($result);
        return $admin;
    }

    public static function password_check($password, $existing_hash) {

        $hash = crypt($password, $existing_hash);
        if ($hash === $existing_hash) {
            return true;
        } else {
            return false;
        }
    }

    public static function login($username, $password) {
        $admin = self::find_username($username);
        if ($admin) {
            // found username, check password.
            if (self::password_check($password, $admin['password'])) {
                //password matches
                return $admin;
            } else {
                //password does not match
                return false;
            }
        } else {
            // admin not found
            return false;
        }
    }

}

$user = new Users();

<?php


/**
 * FIRSTNAME        LASTNAME        PASSWORD        USERNAME
 * Coos             Wolff           secret          Admin
 * Kevin            Doofus          password        Kevin
 */

include_once("../../includes/initialize.php");

if (isset($_POST['submit'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $first_name = $_POST['first_name'];
    $last_name = $_POST['last_name'];

    $login = Users::login($username, $password);

    if($login) {
        $session->logged_in = true;
        redirect_to('index.php');
    } else {
        redirect_to('login.php');
    }

} ?>

<form id='login' action='create_user.php' method='post' accept-charset='UTF-8'>
    <fieldset >
        <legend>Create User</legend>
        <input type='hidden' name='submitted' id='submitted' value='1'/>

        <label for='username' >UserName:</label>
        <input type='text' name='username' id='username'  maxlength="50" />

        <label for='password' >Password:</label>
        <input type='password' name='password' id='password' maxlength="50" />

        <label for='firstName' >FirstName:</label>
        <input type='text' name='first_name' id='first_name'  maxlength="50"  />

        <label for='lastName' >LastName:</label>
        <input type='text' name='last_name' id='last_name'  maxlength="50" />

        <input type='submit' name='submit' value='Submit' />
    </fieldset>
</form>

<hr /><br /><hr />

<form id='login' action='login.php' method='post' accept-charset='UTF-8'>
    <fieldset >
        <legend>Login</legend>
        <input type='hidden' name='submitted' id='submitted' value='1'/>

        <label for='username' >UserName:</label>
        <input type='text' name='username' id='username'  maxlength="50" VALUE="Kevin"/>

        <label for='password' >Password:</label>
        <input type='password' name='password' id='password' maxlength="50" />

        <label for='firstName' >FirstName:</label>
        <input type='text' name='first_name' id='first_name'  maxlength="50" value="Kevin" />

        <label for='lastName' >LastName:</label>
        <input type='text' name='last_name' id='last_name'  maxlength="50" value="Doofus"/>


        <input type='submit' name='submit' value='Submit' />
    </fieldset>
</form>

session.php

function redirect_to($location = NULL) {
    if ($location != NULL) {
        header("Location: {$location}");
        exit;
    }
}

function include_layout_template($template="") {
    include(SITE_ROOT.DS.'public'.DS.'layouts'.DS.$template);
}

<?php

require_once('../../includes/initialize.php'); ?>
<?php if (!$session->is_logged_in()) { redirect_to("login.php"); } ?>

<?php  include_layout_template("admin_header.php"); ?>
<a href="logout.php">Logout</a>


<?php  include_layout_template("admin_footer.php"); ?>

<?php


class Session {

    public $logged_in = false;
    public $user_id;
    public $message;

    function __construct() {
        session_start();
        $this->check_message();
        $this->check_login();
        if($this->logged_in) {
            // actions to take right away if user is logged in
        } else {
            // actions to take right away if user is not logged in
        }
    }

    public function login_user($user) {
        if($user) {
            $this->user_id = $_SESSION['user_id'] = $user->id;
            $this->logged_in = true;
        }
    }

    public function is_logged_in() {
        return $this->logged_in;
    }

    public function logout() {
        unset($_SESSION['user_id']);
        unset($this->user_id);
        $this->logged_in = false;
    }

    private function check_login() {
        if(isset($_SESSION['user_id'])) {
            $this->user_id = $_SESSION['user_id'];
            $this->logged_in = true;
        } else {
            unset($this->user_id);
            $this->logged_in = false;
        }
    }
    private function check_message() {
        // Is there a message stored in the session?
        if(isset($_SESSION['message'])) {
            // Add it as an attribute and erase the stored version
            $this->message = $_SESSION['message'];
            unset($_SESSION['message']);
        } else {
            $this->message = "";
        }
    }
}

$session = new Session();
//$message = $session->message();

<?php

require_once('../../includes/initialize.php');

class Users extends DatabaseQuery
{

    protected $tablename = 'users';
    protected $db_fields = array('id', 'first_name', 'last_name', 'password', 'username');
    public $id;
    public $first_name;
    public $last_name;
    public $password;
    public $username;

    public static function create_user($first_name, $last_name, $password, $username)
    {
        global $database;
        $sql = "INSERT INTO users (";
        $sql .= "first_name, last_name, password, username) ";
        $sql .= "VALUES (";
        $sql .= "'{$first_name}', '{$last_name}', '{$password}', '{$username}')";
        $result = $database->query($sql);
        return $result;

    }

    public static function find_username($username) {
        global $database;
        $sql = "SELECT * FROM users ";
        $sql .= "WHERE username= '{$username}' ";
        $sql .= "LIMIT 1";
        $result = $database->query($sql);
        $admin = mysqli_fetch_assoc($result);
        return $admin;
    }


    public static function find_password($username, $password) {
        global $database;
        $sql = "SELECT * FROM users ";
        $sql .= "WHERE username= '{$username}' ";
        $sql .= "And password=".crypt($password) ;
        $sql .= " LIMIT 1";
        $result = $database->query($sql);
        $admin = mysqli_fetch_assoc($result);
        return $admin;
    }

    public static function password_check($password, $existing_hash) {

        $hash = crypt($password, $existing_hash);
        if ($hash === $existing_hash) {
            return true;
        } else {
            return false;
        }
    }

    public static function login($username, $password) {
        $admin = self::find_username($username);
        if ($admin) {
            // found username, check password.
            if (self::password_check($password, $admin['password'])) {
                //password matches
                return $admin;
            } else {
                //password does not match
                return false;
            }
        } else {
            // admin not found
            return false;
        }
    }

}

$user = new Users();

<?php


/**
 * FIRSTNAME        LASTNAME        PASSWORD        USERNAME
 * Coos             Wolff           secret          Admin
 * Kevin            Doofus          password        Kevin
 */

include_once("../../includes/initialize.php");

if (isset($_POST['submit'])) {
    $username = $_POST['username'];
    $password = $_POST['password'];
    $first_name = $_POST['first_name'];
    $last_name = $_POST['last_name'];

    $login = Users::login($username, $password);

    if($login) {
        $session->logged_in = true;
        redirect_to('index.php');
    } else {
        redirect_to('login.php');
    }

} ?>

<form id='login' action='create_user.php' method='post' accept-charset='UTF-8'>
    <fieldset >
        <legend>Create User</legend>
        <input type='hidden' name='submitted' id='submitted' value='1'/>

        <label for='username' >UserName:</label>
        <input type='text' name='username' id='username'  maxlength="50" />

        <label for='password' >Password:</label>
        <input type='password' name='password' id='password' maxlength="50" />

        <label for='firstName' >FirstName:</label>
        <input type='text' name='first_name' id='first_name'  maxlength="50"  />

        <label for='lastName' >LastName:</label>
        <input type='text' name='last_name' id='last_name'  maxlength="50" />

        <input type='submit' name='submit' value='Submit' />
    </fieldset>
</form>

<hr /><br /><hr />

<form id='login' action='login.php' method='post' accept-charset='UTF-8'>
    <fieldset >
        <legend>Login</legend>
        <input type='hidden' name='submitted' id='submitted' value='1'/>

        <label for='username' >UserName:</label>
        <input type='text' name='username' id='username'  maxlength="50" VALUE="Kevin"/>

        <label for='password' >Password:</label>
        <input type='password' name='password' id='password' maxlength="50" />

        <label for='firstName' >FirstName:</label>
        <input type='text' name='first_name' id='first_name'  maxlength="50" value="Kevin" />

        <label for='lastName' >LastName:</label>
        <input type='text' name='last_name' id='last_name'  maxlength="50" value="Doofus"/>


        <input type='submit' name='submit' value='Submit' />
    </fieldset>
</form>

当我告诉你这件事时，你会笑的。根据报告：

如果省略返回，则返回值NULL

它返回NULL，这是一个“falsy”值，因此您的支票认为它没有登录。

当我告诉您这一点时，您会笑的。根据报告：

如果省略返回，则返回值NULL

它返回null，这是一个“假”值，所以你的检查认为它没有登录。

如果这个答案已经解决了你的问题，请考虑接受它：这真是愚蠢的忘记。遗憾的是，它不起作用。尝试在不同的点对

is\u logged\u in（）

的结果执行

var\u dump（）

，以调试出错的地方。如果我将var\u dump（）放在login.php页面的顶部，它将返回bool（false）。在我的index.php页面上也是如此。不知道为什么。因为如果表单已提交，我会在login.php页面上将其设置为true。请确保在调用了

session\u start（）

之后将其放置在某个位置，并确保将值传递给它，如

var\u dump（$session->is\u logged\u in（））is\u logged\u in（）

的结果执行var\u dump（）
，以调试出错的地方。如果我将var\u dump（）放在login.php页面的顶部，它将返回bool（false）。在我的index.php页面上也是如此。不知道为什么。因为如果表单已提交，我会在login.php页面上将其设置为true。请确保在调用了session\u start（）
之后将其放置在某个位置，并确保将值传递给它，如var\u dump（$session->is\u logged\u in（））